/* Undo */
.undo div {
  top:15px;
  right:15px;
  bottom:15px;
  left:15px;
  border:7px solid white;
  -webkit-border-radius:100%;
  -moz-border-radius:100%;
  border-radius:100%;
}

.undo div:before {
  content:"";
  width:8px;
  height:11px;
  background-color:black;
  top:4px;
  left:-7px;
}

.undo div:after {
  content:"";
  width:0px;
  height:0px;
  border:12px solid transparent;
  border-top-color:white;
  top:-1px;
  left:-20px;
  -webkit-transform:rotate(45deg);
  -moz-transform:rotate(45deg);
  -ms-transform:rotate(45deg);
  -o-transform:rotate(45deg);
  transform:rotate(45deg);
}